A certain kind of snail can have a right-handed direction of shell coiling (D) or left-handed coiling (d). If direction of coiling is due to a protein deposited by the mother in the egg cytoplasm, then a Dd egg-producing snail and a dd sperm-producing snail will have offspring of which genotype(s) and phenotype(s)?

A. 1/2 Dd:1/2 dd; all right coiling

B. 1/2 Dd:1/2 dd; half right and half left coiling

C. all Dd; all right coiling

D. all Dd; half right and half left coiling

E. all Dd; all left coiling